After getting injured during AIT and losing my orders for Fort Campbell, what are the odds I could get Fort Campbell back?

You'll get whatever the Army needs. You're an IET Soldier, you're choices are at the bottom of the priority. You will fill whatever vacancies the Army needs. But, you'll have a chance to pick a new duty station next reenlistment

Ft Hood is huge. It has a motor pool road that is miles long. It has two commissaries. The training area is often hilly.

You will have to go wherever the Army tells you to go. Unfortunately, because you were set back in graduation date branch had to fill that slot. In my opinion all posts are practically the same, the only thing that differs is the surrounding location.